Nikolai Durov created the MTProto protocol that is the basis for the messenger, while Pavel provided financial support and infrastructure through his Digital Fortress fund with partner Axel Neff joining as a second co-founder. Previously the pair founded the Russian social network VK, which they left when it was taken over by the Group. Telegram was launched in 2013 by the brothers Nikolai and Pavel Durov. The service provides end-to-end encryption for voice calls. The client-server communication is also encrypted.
In addition Telegram provides optional end-to-end encrypted "secret" chats between two online users, yet not for groups or channels. ĭefault messages and media in Telegram are encrypted when stored on its servers, but can be accessed by the Telegram service provider, who holds the encryption keys. In March 2018, Telegram stated that it had 200 million monthly active users. The service also provides APIs to independent developers. Telegram's client-side code is open-source software but the source code for recent versions is not always immediately published, whereas its server-side code is closed-source and proprietary. Users can send messages and exchange photos, videos, stickers, audio and files of any type. Telegram client apps are available for Android, iOS, Windows Phone, Windows NT, macOS and Linux. Telegram is a cloud-based instant messaging and voice over IP service.
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